Miller plasma fault light problem
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  1. #1
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    Default Miller plasma fault light problem

    i have a spectrum 625 plasma machine that is giving a Temp fault light . when i turn the machine on
    from cold @ around 55 deg - the air and cup lights go out , but the temp light stays lit and the thing won't
    start . if i leave it idling long enough , the light will go out and i can get it to spray for about 2 seconds before it quits and the temp faults again.

    i haven't used the machine in about a year - are there relays, contactors or sensors i should inspect
    when i pull the covers ? i have the miller schematic, but it is more of ageneral wiring diagram and
    of little help to me.

  2. #2
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    It probably has a mechanical thermal switch somewhere in there that could use replacing. Think of where it would get hot and look for a little thing with two wires. Could be a metal can, could be a little tube, could be bolted to a transformer or heatsink or in the airflow.

  3. #3
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    if its like a hypertherm, they do that when the contact tip gets worn out and it will prevent it from starting. it protects the cable that way.

  4. #4
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    new cup, cone, swirl and tip. cable tests good for continuity.

  5. #5
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    ya could be anything electrical internally. failures happen easier when colder. need someone good with electronics to test all the circuits related to it.


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